Lithium-ion batteries with both low-temperature (low-T) adaptability and high energy density demand advanced
cathodes.
However, state-of-the-art high-voltage (high-V) cathodes
still suffer insufficient performance at low T, which
originates from the poor cathode–electrolyte interface compatibility.
Herein, we developed a shallow surface Zr-doped and Li+ conductive Li2Zr(PO4)2 (LZPO) interspersed
massage-ball-like LiCoO2 (LZPO-LCO). The surface-interspersed
LZPO can induce an electrolyte superwettability of LZPO-LCO, which
helps to form a high-quality cathode–electrolyte interphase
with strong stability and low interface resistance. Without changing
electrolyte, even at a low T of −25 °C
and a high V of 4.6 V, LZPO-LCO shows an ultrahigh
capacity of ∼200 mAh g–1 at 0.2C and 137
mAh g–1 at 5C, maintaining 94% capacity after 100
cycles with an average Coulombic efficiency of 99.9%. Besides, the
fabricated full cells deliver a high energy density of ∼340
Wh kg–1 and maintain 92% capacity after 200 cycles
at −25 °C. This work provides a significant leap forward
for high-performance low-T cathodes.
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